From 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 02:46:07 +0000
Subject: [PATCH] add audio
---
kernel/sound/core/control_compat.c | 35 ++++++++++++-----------------------
1 files changed, 12 insertions(+), 23 deletions(-)
diff --git a/kernel/sound/core/control_compat.c b/kernel/sound/core/control_compat.c
index 3fc2166..980ab35 100644
--- a/kernel/sound/core/control_compat.c
+++ b/kernel/sound/core/control_compat.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* compat ioctls for control API
*
* Copyright (c) by Takashi Iwai <tiwai@suse.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* this file included from control.c */
@@ -35,24 +22,22 @@
static int snd_ctl_elem_list_compat(struct snd_card *card,
struct snd_ctl_elem_list32 __user *data32)
{
- struct snd_ctl_elem_list __user *data;
+ struct snd_ctl_elem_list data = {};
compat_caddr_t ptr;
int err;
- data = compat_alloc_user_space(sizeof(*data));
-
/* offset, space, used, count */
- if (copy_in_user(data, data32, 4 * sizeof(u32)))
+ if (copy_from_user(&data, data32, 4 * sizeof(u32)))
return -EFAULT;
/* pids */
- if (get_user(ptr, &data32->pids) ||
- put_user(compat_ptr(ptr), &data->pids))
+ if (get_user(ptr, &data32->pids))
return -EFAULT;
- err = snd_ctl_elem_list(card, data);
+ data.pids = compat_ptr(ptr);
+ err = snd_ctl_elem_list(card, &data);
if (err < 0)
return err;
/* copy the result */
- if (copy_in_user(data32, data, 4 * sizeof(u32)))
+ if (copy_to_user(data32, &data, 4 * sizeof(u32)))
return -EFAULT;
return 0;
}
@@ -236,7 +221,7 @@
{
struct snd_ctl_elem_value32 __user *data32 = userdata;
int i, type, size;
- int uninitialized_var(count);
+ int count;
unsigned int indirect;
if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
@@ -319,7 +304,9 @@
err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
if (err < 0)
goto error;
+ down_read(&card->controls_rwsem);
err = snd_ctl_elem_read(card, data);
+ up_read(&card->controls_rwsem);
if (err < 0)
goto error;
err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
@@ -347,7 +334,9 @@
err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
if (err < 0)
goto error;
+ down_write(&card->controls_rwsem);
err = snd_ctl_elem_write(card, file, data);
+ up_write(&card->controls_rwsem);
if (err < 0)
goto error;
err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
--
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